Rev 5:1-2 And I saw in the right hand of him that sat on the throne a book written within and on the backside, sealed with seven seals. (2) And I saw a strong angel proclaiming with a loud voice, Who is worthy to open the book, and to loose the seals thereof?
I believe the sealed book in the hand of the one sitting on the throne is the book that Daniel was instructed to seal up....
Dan 12:4 But thou, O Daniel, shut up the words, and seal the book, even
to the time of the end: many shall run to and fro, and knowledge shall be increased.
......so that the Revelation of John from chapter 6:1 onward is the opening of the sealed book. The opening of each subsequent seal is like the turning of pages in the vision. Notice, at the end of the revelation ...
Rev 22:10 And he saith unto me, Seal not the sayings of the prophecy of this book(biblio -"roll" as in a scroll, writing): for the
time is at hand.
If you line up the trumpets and the bowls, you see that several line up, alternately (Rev 15:1 And I saw another sign in heaven, great and marvellous, seven angels having the seven last plagues; for in them is filled up(teleo-finished/completed) the wrath of God.
Trumpet #2 a third of the seas turned to blood
Bowl #2 all of the seas turn to blood
Trumpet#2 a third of the rivers and fountains turned to blood
Bowl #3 all the rivers and fountains turned to blood
Trumpet #7 Rev 10:7 But in the days of the voice of the seventh angel, when he shall begin to sound,
the mystery of God should be finished, as he hath declared to his servants the prophets.
Rev 11:15 And the seventh angel sounded; and there were great voices in heaven, saying, The kingdoms of this world are become the kingdoms of our Lord, and of his Christ; and he shall reign for ever and ever
Bowl #7 Rev 16:15-18 Behold, I come as a thief. Blessed is he that watcheth, and keepeth his garments, lest he walk naked, and they see his shame. (16) And he gathered them together into a place called in the Hebrew tongue Armageddon. (17) And the seventh angel poured out his vial into the air; and there came a great voice out of the temple of heaven, from the throne, saying,
It is done. (18) And there were voices, and thunders, and lightnings; and there was a great earthquake, such as was not since men were upon the earth, so mighty an earthquake, and so great.
Notice also that immediately before the seventh trumpet sounds a voice from heaven shouts "Come up here" and the two witnesses are raised and ascend "in a cloud". Then it says this is the second woe the third cometh "quickly"(tachu" immediately, suddenly)
Rev 11:12-14 And they heard a great voice from heaven saying unto them, Come up hither. And they ascended up to heaven in a cloud; and their enemies beheld them. (13) And the same hour was there a great earthquake, and the tenth part of the city fell, and in the earthquake were slain of men seven thousand: and the remnant were affrighted, and gave glory to the God of heaven. (14) The second woe is past; and, behold, the third woe cometh quickly.
So, I believe that the trumpets, the bowls, the vision of the two witnesses, the vision of the sun clothed woman and the dragon, and the vision of the towering messenger are all parallel(simultaneously occurring timelines...stories happening alongside and with each other) events that consummate at the second coming and glorious appearing of Jesus.
At the "last trumpet" (7th) the mystery of God is finished. Why?

No More Mystery. Christ in you the hope of glory is declared to the entire universe by the resurrection of those who are "His at his appearing" - the revelation of the sons of God. The open authority of Jesus Christ and the kingdom of priests restoring the creation from futility and ushering in the just(meted out in measure as deserved) punishments of God begins. The restitution of all things will be the openly declared will and work of God, as all the enemies are being made subject to His feet by the rod of iron.
The 7th bowl is introduced with the words, "Behold I come as a thief" and the words "It is done"(It hath come! YLT)
To sum up, I believe the seals are a part of the scroll in the hand, the vision itself
Isa 29:10-12 For poured out on you hath Jehovah a spirit of deep sleep, And He closeth your eyes--the prophets, And your heads--the seers--He covered. (11) And the vision of the whole is to you, As words of the sealed book, That they give unto one knowing books, Saying, `Read this, we pray thee,' And he hath said, `I am not able, for it is sealed;' (12) And the book is given to him who hath not known books, Saying, `Read this, we pray thee,' And he hath said, `I have not known books.'
The unfolding visions and events that are described after each seal breaks are a combination of 1)age-during(applicable in every generation) revelations about the spiritual bride, man-child, harlot, beast, etc. 2) pictures of the events immediately preceding and surrounding the second coming and glorious kingdom of God "swallowing" the kingdoms of this world.
Example: The woman clothed with the sun full to birth with a man-child is a picture of the bride/church/temple of God clothed again in glory, mature, ready to birth....as in Eph ch. 4
Eph 4:11-16 And he gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers; (12) For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ: (13)
Till we all come in the unity of the faith(
woman clothed in the sun, i.e. manifest presence, shining, city set on a hill, lamp on stand-not under a bushel[/color], and of the knowledge of the Son of God, unto a perfect(mature, complete) man, unto
the measure of the stature of the fulness of Christ(
man-child): (14) That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine,
by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive(
dragon and flood of water); (15) But speaking the truth in love, may grow up into him in all things, which is the head, even Christ: (16) From whom the whole body fitly joined together and compacted by that which every joint supplieth, according to the effectual working in the measure of every part, maketh increase of the body unto the edifying of itself in love.
This is a general principle, I'm not trying to establish doctrine or eschatological identities- but the principles illustrated in the vision of the woman clearly speak through out the age even if they are going to be ultimately fulfilled/consummated/realized at the end of the age. Whenever a body of believers becomes mature as the Bride in pure betrothal to Christ, He dwells fully in them (manifest presence, filled with the Holy Spirit) and although the enemy sends floods of persecution and false teaching to swallow her, if she perseveres (saved through child birth) the mature man will be birthed (overcomers destroying the works of the devil)and make war against the dragon.
I hope some of this is helpful to someone.....test all things, hold fast that which is good
